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9.3) Exodus (University of Wisconsin) (Research Systems - OO Data Model - Object-oriented Databases And Vendors)




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This article is from the Object-Oriented Technology FAQ, by Bob Hathaway rjh@geodesic.com with numerous contributions by others.

9.3) Exodus (University of Wisconsin) (Research Systems - OO Data Model - Object-oriented Databases And Vendors)

EXODUS is a DBMS from the University of Wisconsin. An overview,
excerpted from the abstract of [CDG+90] reads:

EXODUS, an extensible database system project that is
addressing data management problems posed by a variety of
challenging new applications. The goal of the project is to
facilitate the fast development of high-performance,
application-specific database systems. EXODUS provides
certain kernel facilities, including a versatile storage
manager. In addition, it provides an architectural framework
for building application-specific database systems; powerful
tools to help automate the generation of such systems,
including a rule-based query optimizer generator and a
persistent programming language; and libraries of generic
software components (e.g., access methods) that are likely to
be useful for many application domains.

The programming language is called E, an extension of C++. [RC89]

REFERENCES:
(see "ftp.cs.wisc.edu:exodus/bibliography" for a complete list)

[CDG+90] Michael J. Carey, David J. DeWitt, Goetz Graefe,
David M. Haight, Joel E. Richardson, Daniel T. Schuh,
Eugene J. Skekita, and Scott L. Vandenberg. The EXODUS
extensible DBMS project: An overview. In Stanley B.
Zdonik and David Maier, editors, Readings in
Object-Oriented Database Systems, Data Management
Series. Morgan Kaufmann, San Mateo, CA, 1990. Also
available as WISC-CS-TR 808.

[CDRS89] Michael J. Carey, David J. DeWitt, Joel E. Richardson,
and Eugene J. Skekita. Storage management for objects
in EXODUS. In Won. Kim and Frederick H. Lochovsky,
editors, Object-Oriented Concepts, Databases and
Applications, chapter 14. Addison-Wesley, Reading, MA,
1989. After Carey et al. Object and File Management in
the EXODUS Database System, Proceedings of the Twelveth
International Conference on Very Large Data Bases,
1986.

[GD87] G. Graefe and D. DeWitt. The EXODUS optimizer
generator. In U. Dayal and I. Traiger, editors,
Proceedings of the SIGMOD International Conference on
Management of Data, San Francisco, CA, May 1987.

[RC89] Joel E. Richardson and Michael J. Carey. Persistence in
the E language: Issues and implementation. Software --
Practice and Experience, 19(12):1115--1150, December
1989.

FTP: source code, documentation and a complete bibliography can be
found at ftp.cs.wisc.edu:exodus/

See also APPENDIX E.

On Schema Evolution (from original survey):
No solution for the problem of schema evolution is provided.
Emulation is rejected by the authors, who claim that the addition of a
layer between the EXODUS Storage Manager and the E program would
seriously reduce efficiency. Automatic conversion, whether lazy or
eager, is also rejected, as it does not mesh well with the C++ data
layout. To implement immediate references to other classes and
structures, C++ embeds class and structure instances within its
referent. The resulting change in the size of the object might
invalidate remote pointer references.

Joel E. Richardson and Michael J. Carey. "Persistence
in the E language: Issues and Implementation." Appeared
in "Software -- Practice and Experience",
19(12):1115-1150, December 1989.

 

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